Toolholder



Patented Aug. 8, 1944 UNITED [STATES PATENT OFFICE 1 assaszij i I TQOLHOLD E R V James Palmer, Binghamton, N. Y.,Vassignor' to International Business Machines Corporation, New York, Y., a corporation of New Application April 14, 1943, Serial No. 483,003

7 4 Claims. v(o1; 29-96) This inventionrelates to improvements in devices for holding cutting tools and more specifically to a tool holder with an adjustable sleeve for varying the setting of a diamond edged cutter for minute angular and linear adjustments.

In the turning of brass cylinders or rolls for use as rotogravure electros, it is necessary to prepare the cylindrical surfaces with a Smooth finish. Not only is the finish of acritical nature, but the outside diameter of such rollsmust be held to close tolerances. The roll is turned down and a finishing cut is taken by the diamond tipped tool moved parallel to the axis of the roll, but at a fixed radial distance. It was found that changes in setting of the diamond pointed tool were diffi cult to obtain to secure a better cutting angle and changes in outside diameter of the turned object. Heretofore, it was required that the cutterbe adjusted by hand and hours are sometimes needed to obtain the properadjustment by the cut and try method, 1 A j An object of theinvention is to provide a tool holder with devices for making minute changes in axial and angular relation of a cutter with respect to the holder.

Another object of the invention is to form the body of a tool holding frame with an annular recess in which is loosely fitted a spanner nut for imparting linear adjustment movement to a threaded tool holding sleeve, one end of said recess being closed by a pinned collar for ease of assembly.

Another object of the invention is the provision of a tool holding cylinder mounted within a sleeve having relative axial movement and adjustment with respect to a fixed frame.

Other objects of the invention Willbe pointed out in the following description and claims and illustrated in the accompanying drawing, which discloses, by way of example, the principle of the invention and the best mode, which has been contemplated, of applying that principle.

In the drawing:

Fig. l is an end view of the tool holding device.

- Fig. 2 is a side view of the tool holder.

Fig. 3 is a plan view of the improved cutting device.

Fig. 4 is a sectional view taken along the line 4--4 of Fig. 3.

Fig. 5 is a sectional elevation view taken along line 5-5 of Fig. 3. V

The tool holder comprises a main outer frame or body formed with a holding projection 2| having a threaded end 22 for securingthe frame such as a lathe, boring, or milling machine. The upper part of the frame 20 is extendedat 20 and rounded for a clamp bolt. For purposes of clearance, the extension Zll is-cut out at 23 and it is further formed with a slit 24 (Fig.3) across which is threaded a bolt 25 for pinching a sleeve 26 (Fig.

5) also slotted at 26' and fitted Within a circular opening running through the-length of frame 20.

Within sleeve 26 is slidably fitted a tool holding member or cylinder 21 which is formed with an enlarged head 28 having radial spanner adjustment openings 29. Fitted within the cylinder 21 is a cylindrical tool bit 30 having a cutting end, such as the diamond point 3| shown cooperating with the work 32. A set screw 21' in thehead 28' holds the tool 30 fixed to cylinder 21. The tool bit 30 is held in axial position with respect to cylinder 21 by a backing set screw 33 threaded in from'the 7 rear to the center of the cylinder. Also attached to. the end of cylinder .21. is a circular nut :34 formed with radialspanner openings and cooperatingwith threads. 35 formedon therear of the cylinder. This nut 34 is provided to abut against the end of sleeve 26 to fasten the sleeve to the cylinder 21 so that they can be adjusted axially as one part.

Sleeve 26 is held from rotation by a key 36 fastened therein and cooperating with a key slot 31 formed in the wall of frame 20. The body or main frame is formed with another slot or recess having an upper rectangular opening 38 and a continuing semi-circular opening or depression within the end of the frame. Into' this recess is fitted a circular tapped nut 39 cooperating with threads 40 formed on the end of sleeve 26. Nut 39 is provided with radial spanner adjusting openings 4| distributed around the outer surface. The rear end of the frame 20 is formed with a circular opening into which is fitted a ring or collar 42 encircling the sleeve 26 and fastened to the frame by pins 43. This collar provides a means of assembly for the adjustment nut 39 which is threaded on the sleeve and assembled in to the traveling carriage of a cutting machine,

opening 38 before collar 42 is secured to the frame to hold the adjustment nut in place. The two threaded circular nuts 34 and 39 provide adjustin-g and holding means whereby the setting of the cutting edge may be varied minute distances in axial as well as angular directions. The degree of angular variation is determined and measured with respect to a scale of graduation lines 44 (Fig. 2) inscribed on the periphery of head 28. Cooperating with these lines is a pointer 45 secured to the side of the frame. Angular adjustment is produced by first partially loosening H..- F. PARKER ELECTRIC HOIST Aug. 8,

Filed April 8, 1942 2 Sheets-Sheet l O swww O Q =L 

